经上皮准分子激光角膜切削术治疗近视散光术后散光的矢量分析

doi:10.3760/cma.j.issn.1674-845X.2018.05.010

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Abstract

Objective: To investigate outcomes of myopic astigmatism correction after transepithelial photorefractive keratectomy (TransPRK) for myopic astigmatism using the Alpins method, and to explore factors affecting the correction of astigmatism. Methods: In this retrospective study, 99 patients (167 eyes with myopic astigmatism) during January 2014 to June 2016 in Joint Shantou International Eye Center were chosen and then divided into a low astigmatism group (-0.25- -0.75 D) and a high astigmatism group (-1.00- -4.75 D).Astigmatism status was evaluated based on astigmatism before treatment and 3 months after treatment based on Alpins vector analysis. Pre-op and post-op indexes were compared with a paired t-test, and the correlation of factors affecting the correction of astigmatism was analyzed by Pearson correlation.results: Before surgery, spherical power was -3.57 ± 1.22 D and astigmatism was -0.93 ± 0.62 D based on subjective refraction; and 3 months after surgery spherical power was +0.12 ± 0.25 D and astigmatism was -0.04 ± 0.23 D. Target-induced astigmatism (|TIA|) was 0.86 ± 0.58 D, surgery-induced astigmatism (|SIA|) was 0.87 ± 0.59 D, the difference vector (|DV|) was 0.10 ± 0.21 D, the magnitude of error (ME) was 0.01 ± 0.17 D, the angle of error (AE) was 1.49° ± 13.27° and the correction index (CI) was 0.98 ± 0.33.|SIA| and |TIA| were positively correlated (r=0.94, P < 0.001), |AE| and |DV| were positively correlated (r=0.83, P < 0.001) and ME and |SIA| were positively correlated (r=0.23, P < 0.001). The two groups had a similar |DV|, ME and CI. The low astigmatism group's |AE| was 5.78° ± 16.34°, and the high astigmatism group's |AE| was 1.82° ± 4.41° (t=2.02, P=0.04). After TransPRK, 37 eyes (22.0%) had astigmatism, and 60% of eyes had an axis change of more than 30°. We found that the preoperative cylinder axis moved counter-clockwise to the postoperative cylinder axis, which changed -2.30° ± 45.88°. conclusions:Postoperative astigmatism using TransPRK has a close relationship with the accuracy of astigmatism and
axis correction. In order to reduce postoperative astigmatism, it is necessary to improve the accuracy of the astigmatism and axial direction during the procedure.

Key words： astigmatism transepithelial photorefractive keratectomy vector analysis

Received: 09 November 2017

Fund:

Guangdong Medical Science and Technology Research Foundation (A2016404)

Corresponding Authors: Mingzhi Zhang, Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou 515041, China (Email: zmz@jsiec.org)

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	Lixia Sun
	Meishan Gu
	Riping Zhang
	Jinyu Li
	Senmao Li
	Mingzhi Zhang

Cite this article:

Lixia Sun,Meishan Gu,Riping Zhang等. Vector Analysis of Astigmatism after Transepithelial Photorefractive Keratectomy for Myopic Astigmatism[J]. Chinese Journal of Optometry Ophthalmology and Visual science, 2018, 20(5): 306-312.

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https://www.cjoovs.com/EN/10.3760/cma.j.issn.1674-845X.2018.05.010 OR https://www.cjoovs.com/EN/Y2018/V20/I5/306

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